On Fri, Jul 1, 2011 at 2:22 AM, David Erickson <deric...@stanford.edu>wrote:
> On 06/30/2011 03:38 AM, Wei-Chih Chen wrote: > >> Dear David and Ben, >> >> >> Sorry, I can not figure it out. @@ >> Could you give more details? Thank you. >> packets-> OpenFlow switch transfers packets to OpenFlow messages-> >> OpenFlow messages-> controller receives, handles(drop, modify...)-> >> modified OpenFlow messages-> OpenFlow switch receives and routes these >> messages >> Is it correct? >> > > Here is a simplified view: > Packets come into an OpenFlow switch, if they match a flow in the flow > tables then the corresponding actions for that flow are applied to the > packet (ie send out a port, rewrite some header, etc). If there is no > match, typically the packet is encapsulated in an OpenFlow PacketIn message > and sent to the controller. The controller then decides what to do with > that packet (and others coming from the same flow), and sends a FlowMod > message back to the switch which modifies the flow tables on the switch with > the controller's decision. Does this FlowMod message contain that packet? > > > Are OpenFlow messages here the same as network packets? >> > > OpenFlow messages are contained in network packets, and may contain network > packets :). > >From the above statements, I know that OpenFlow PacketIn messages contains network packet, but how are OpenFlow messages contained in network packets? [?] Maybe these concepts are described in the white paper or specification. I am sorry that I have not read these with details. [?] You can just point out where I should read if they are in the documents. > > -D > By the way, do you know how Citrix *vSwitch Controller* communicates with *Open vSwitch* on XenServer and manages multiple switches? Is it also through OpenFlow? Thanks. [?] Regards, Wayne
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